IF statement dealing with current time

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sd_journal_get_monotonic_usec

SD_JOURNAL_GET_REALTIME_USEC(3) 			   sd_journal_get_realtime_usec 			   SD_JOURNAL_GET_REALTIME_USEC(3)

NAME

       sd_journal_get_realtime_usec, sd_journal_get_monotonic_usec - Read timestamps from the current journal entry

SYNOPSIS

       #include <systemd/sd-journal.h>

       int sd_journal_get_realtime_usec(sd_journal* j, uint64_t* usec);

       int sd_journal_get_monotonic_usec(sd_journal* j, uint64_t* usec, sd_id128_t* boot_id);

DESCRIPTION

       sd_journal_get_realtime_usec() gets the realtime (wallclock) timestamp of the current journal entry. It takes two arguments: the journal
       context object and a pointer to a 64-bit unsigned integer to store the timestamp in. The timestamp is in microseconds since the epoch, i.e.
       CLOCK_REALTIME.

       sd_journal_get_monotonic_usec() gets the monotonic timestamp of the current journal entry. It takes three arguments: the journal context
       object, a pointer to a 64-bit unsigned integer to store the timestamp in, as well as a 128-bit ID buffer to store the boot ID of the
       monotonic timestamp. The timestamp is in microseconds since boot-up of the specific boot, i.e.  CLOCK_MONOTONIC. Since the monotonic clock
       begins new with every reboot, it only defines a well-defined point in time when used together with an identifier identifying the boot. See
       sd_id128_get_boot(3) for more information. If the boot ID parameter is passed NULL, the function will fail if the monotonic timestamp of
       the current entry is not of the current system boot.

       Note that these functions will not work before sd_journal_next(3) (or related call) has been called at least once, in order to position the
       read pointer at a valid entry.

RETURN VALUE

       sd_journal_get_realtime_usec() and sd_journal_get_monotonic_usec() returns 0 on success or a negative errno-style error code. If the boot
       ID parameter was passed NULL and the monotonic timestamp of the current journal entry is not of the current system boot, -ESTALE is
       returned by sd_journal_get_monotonic_usec().

NOTES

       The sd_journal_get_realtime_usec() and sd_journal_get_monotonic_usec() interfaces are available as a shared library, which can be compiled
       and linked to with the libsystemd-journal pkg-config(1) file.

SEE ALSO

       systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_next(3), sd_journal_get_data(3), sd_id128_get_boot(3), clock_gettime(2),
       sd_journal_get_cutoff_realtime_usec(3)

systemd 208													   SD_JOURNAL_GET_REALTIME_USEC(3)

Shell Programming and Scripting